1. Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Rämistrasse 100, CH-8091 Zurich, Switzerland
2. Institute of Medical Virology, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
3. Life Science Zurich Graduate School, Microbiology and Immunology PhD Programme, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
4. Regional Hospital Bamenda, PO Box 863, Mankon-Bamenda, Cameroon
5. District Hospital Kumba, Meme Division, South-West Region, Cameroon
6. District Hospital Ndop, Ngoketunjia Division, North-West Region, Cameroon
7. Regional Hospital Ngaoundere, Avenue Rue Ahidjo Ngaoundéré, Adamawa, Cameroon